Hide your caller ID on a per-call basis (🇦🇺)

Dial #31# before the number you're calling.¹

Sometimes you need to make work calls from your personal mobile, but you don't want to permanently disable your caller ID as that would be inconvenient for your friends/family.

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1. Test it before you use it in a situation where it matters. It's the same across Telstra, Optus, and Vodafone. ↩